Outlook cache after recreate an User on Exchange 2010

An administrator accidentally deleted 4 users on the Network, and it wasnt able to restore from System State backup. So, I recreated these users and restore their mailboxes (fortunately I could restore their mailbox from the bakcup).

Now, all the internal users are trying to send email to these "new" users using the Outlook autocomplete cache (i.e. only typing 2 characters and it completes with the user's name), but the message cannot be delivered.:

Outlook 2010 integrates the Autocomplete list into the mailbox. Which is rather hard to work with. For the 2007 and earlier users you could simply delete the NK2 file or make a tool to scan it for internal Exchange adresses. If you want scan for it and edit it, you can take a look at: http://msdn.microsoft.com/en-us/library/ff625291.aspx. The file itself is under %APPDATA%\Microsoft\Outlook and has the same name as the outlook profile.

search the PC for an NK2 file - it is what outlook uses as a cache for names users have been emailing. If the outlook local profile name changes this can stop being used. it needs to be in the "usual" location MS Outlook expects it to be in and has the same name as the Outlook profile being used.

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